“Happy Birthday” translates to “Hau`oli Lā Hānau” in Hawaiian. “Hau`oli” means “Happy, glad, gay, joyful,” “Lā” means “Day, date” (as well as “sun, sunny”), and “Hānau” means “To give birth; to lay (an egg); born.”
Note that the first “a” in both “Lā” and “Hānau” include the kahakō, or a macron, a Hawaiian diacritical mark indicating a long vowel sound.
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